255815878 has 8 divisors (see below), whose sum is σ = 386484840. Its totient is φ = 126987600.

The previous prime is 255815863. The next prime is 255815887. The reversal of 255815878 is 878518552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 459823 + ... + 460378.

It is an arithmetic number, because the mean of its divisors is an integer number (48310605).

Almost surely, 2^255815878 is an apocalyptic number.

255815878 is a deficient number, since it is larger than the sum of its proper divisors (130668962).

255815878 is a wasteful number, since it uses less digits than its factorization.

255815878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920342.

The product of its digits is 896000, while the sum is 49.

The square root of 255815878 is about 15994.2451525541. The cubic root of 255815878 is about 634.8081574772.

The spelling of 255815878 in words is "two hundred fifty-five million, eight hundred fifteen thousand, eight hundred seventy-eight".